This quiz works best with JavaScript enabled. Home > Cbse > Class 7 > Science > Electric Current And Its Effects > Class 7 Science Chapter 10 Electric Current And Its Effects – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 8 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Does the compass needle show deflection for lemon juice A) Yes. B) No. C) All the above. D) None of the above. Show Answer Correct Answer: A) Yes. 2. An electric cell produces electricity from the ..... in it. A) Bases stored. B) Food stored. C) Chemicals stored. D) Acid stored. Show Answer Correct Answer: C) Chemicals stored. 3. When an electric current flows through a wire, it behaves like a magnet. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 4. When a liquid conducts electricity, a process other than conduction also takes place. What process is this? A) Electroplating. B) Electrochemical reaction. C) Oxidation. D) Electrolysis. Show Answer Correct Answer: D) Electrolysis. 5. A cell has a ..... on the top A) Metal disk. B) Head cap. C) Hat. D) Metal cap. Show Answer Correct Answer: A) Metal disk. 6. Is Vinegar a conductor of electricity? A) False. B) Maybe. C) Not mentioned in the text. D) True. Show Answer Correct Answer: A) False. 7. During photosynthesis, the stomata help in the intake of A) Oxygen. B) Water. C) Nitrogen. D) Carbon dioxide. Show Answer Correct Answer: D) Carbon dioxide. 8. When the plane of the loop is parallel to the magnetic field the torque on the current loop is ..... A) Zero. B) Equal. C) Minimum. D) Maximum. Show Answer Correct Answer: D) Maximum. 9. The total sum of the kinetic energy in a given sample A) Heat. B) Density. C) Salinity. D) Temperature. Show Answer Correct Answer: A) Heat. 10. Long wire generates more heat than shorter wire. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 11. Copper wires are used as conducting wires. because A) It offers no resistance. B) It offers very high resistance. C) Very cheap in price and easily available. D) It offers very less resistance. Show Answer Correct Answer: D) It offers very less resistance. 12. True or False:The electrode which is connected to the negative terminal of a battery is called the anode. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 13. When number of turns in solenoid increase, electromagnetic strength ..... A) Increase. B) Decrease. C) All the above. D) None of the above. Show Answer Correct Answer: A) Increase. 14. ..... and ..... affect the ocean's density and cause the Global Conveyor Belt to travel A) Gravity and the Coriolis Effect. B) Temperature and salinity. C) Wind and climate. D) Temperature and the Coriolis Effect. Show Answer Correct Answer: B) Temperature and salinity. 15. An object becomes charged when the atoms in the object gain or lose A) Electrons. B) Protons. C) Neutrons. D) All of the above. Show Answer Correct Answer: A) Electrons. 16. The frequency of A.C. in India is: A) 100 Hz. B) 25 Hz. C) 75 Hz. D) 50 Hz. Show Answer Correct Answer: D) 50 Hz. 17. The phenomenon of electromagnetic induction is: A) The process of charging a body. B) The process of generating magnetic field due to current passing through the coil. C) Producing induced current in a coil due to relative motion between a magnet and a coil. D) The process of rotating a coil of an electric motor. Show Answer Correct Answer: C) Producing induced current in a coil due to relative motion between a magnet and a coil. 18. The work done in moving the charge Q through a potential difference V A) V/Q. B) QV. C) Q/V. D) 1/QV. Show Answer Correct Answer: B) QV. 19. The difference in electrical potential energy between two charged bodies is called ..... A) Current. B) Power. C) Charge. D) Voltage. Show Answer Correct Answer: D) Voltage. 20. What is the driving force of the deep water ocean conveyor belt? A) Winds push the deep water into the Pacific and Indian oceans. B) Gravity from the moon pulls the water towards the equator. C) The spinning of Earth makes the deep water current run in circular paths. D) Very cold temperatures at the poles create very cold, salty water that pushes the deep water current. Show Answer Correct Answer: D) Very cold temperatures at the poles create very cold, salty water that pushes the deep water current. 21. The magnetic field around a current-carrying coil lasts. A) Till his half-period life. B) Field is permanent. C) As long as current flows through it. D) For three hours. Show Answer Correct Answer: C) As long as current flows through it. 22. A device used to measure the amount of electric current flowing through a circuit. A) Ammeter. B) Voltmeter. C) Battery. D) Resistor. Show Answer Correct Answer: A) Ammeter. 23. Which of the following substance is used to make an electromagnet: A) Steel. B) Aluminium. C) Copper. D) Soft iron. Show Answer Correct Answer: D) Soft iron. 24. When electric current flows through the metal filament of the bulb it gets heated to very high temperature and becomes ..... hot and start emitting ..... A) Red, heat. B) White, heat. C) Red, light. D) White, light. Show Answer Correct Answer: D) White, light. 25. Objects that have opposite charges A) Are attracted to each other, and the force between the objects pulls them together. B) Are attracted to each other, and the force between the objects pushes them apart. C) Are repelled by each other, and the force between the objects pulls them together. D) Are repelled by each other, and the force between the objects pushes them apart. Show Answer Correct Answer: A) Are attracted to each other, and the force between the objects pulls them together. 26. What are huge wheels that rotate when pushed by water, wind, or steam? A) Turbines. B) Magnet wheels. C) Generators. D) Batteries. Show Answer Correct Answer: A) Turbines. 27. Which of these particles are responsible for the flow of electric current? A) Electons. B) Protons. C) Neutrons. D) None of the above. Show Answer Correct Answer: A) Electons. 28. Good conductors are ..... resistors A) Bad. B) Good. C) All the above. D) None of the above. Show Answer Correct Answer: A) Bad. 29. The unit of what is named oersted in honour of Hans Oersted A) Magnetic field. B) Electromagnetism. C) Magnetic field strength. D) Magnetism. Show Answer Correct Answer: C) Magnetic field strength. 30. Which of the given statements is incorrect regarding magnetic field lines? A) The direction of magnetic field at a point is taken to be the direction in which the north pole of a magnetic compass needle points. B) Magnetic field lines are closed curves. C) If magnetic field lines are parallel and equidistant, they represent zero field strength. D) Relative strength of magnetic field is shown by the degree of closeness of the field lines. Show Answer Correct Answer: C) If magnetic field lines are parallel and equidistant, they represent zero field strength. 31. Which of the property a proton can change, when it moves freely in a magnetic field: A) Charge. B) Velocity. C) Mass. D) None of these. Show Answer Correct Answer: B) Velocity. 32. Who discovered heating effect of elecric current? A) Joule-Lence. B) Thomas Edison. C) Michael Faraday. D) James Watt. Show Answer Correct Answer: A) Joule-Lence. 33. Circuit breaker device which can be used in place of fuse in domestic electric wiring is called:- A) MCB. B) CCB. C) MCD. D) None of these. Show Answer Correct Answer: A) MCB. 34. Boojho's uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory A) In the nearby pond. B) In the nearby river. C) In the nearby cornfield. D) According to the disposal guidelines of the local authority. Show Answer Correct Answer: D) According to the disposal guidelines of the local authority. 35. Drift velocity is A) The average velocity with which the electrons are drifted towards the positive terminal of the battery. B) Velocity of an electron in a conductor. C) Average thermal velocity. D) None of these. Show Answer Correct Answer: A) The average velocity with which the electrons are drifted towards the positive terminal of the battery. 36. The D.C. motor works on the principle of:(a)Heating effect of current (b)Chemical effect of current (c)Magnetic effect of current (d)None of these A) Heating effect of current. B) Chemical effect of current. C) Magnetic effect of current. D) None of these. Show Answer Correct Answer: A) Heating effect of current. 37. Which dude discovered that current in a wire caused adeflection in a magnetic compass? A) Tesla. B) Oasted. C) Maxwell. D) Faraday. Show Answer Correct Answer: B) Oasted. 38. If a light bulb is added to a circuit and it turns on, what can we say about this circuit? A) Unbroken. B) Open. C) Incomplete. D) Off. Show Answer Correct Answer: A) Unbroken. 39. Who discovered the Heating Effect of electric current? A) James Prescott Joule. B) Galileo Galilei. C) Hans Christian Oersted. D) Blaise Pascal. Show Answer Correct Answer: A) James Prescott Joule. 40. What is static electricity caused by? A) A balance of power. B) A balance of positive and negative charges. C) . An imbalance of positive and negative charges. D) An imbalance of protons and neutrons. Show Answer Correct Answer: C) . An imbalance of positive and negative charges. 41. Give an example of a substance that undergoes a chemical change due to the effect of electric current. A) Water. B) Salt. C) Oxygen. D) Sugar. Show Answer Correct Answer: A) Water. 42. Out of the following, which metal is used to electroplate iron to make it shining and rust resistant? A) Gold. B) Chromium. C) Tin. D) Zinc. Show Answer Correct Answer: B) Chromium. 43. Which of these materials is an insulator? A) Steel. B) Copper. C) Aluminum. D) Glass. Show Answer Correct Answer: D) Glass. 44. Movements of ocean water in a continuous flow are called? A) Ocean currents. B) Global winds. C) Front. D) Air mass. Show Answer Correct Answer: A) Ocean currents. 45. Kirchhoff's junction rule is a reflection of A) Conservation of current density vector. B) Conservation of charge and no accumulation of charge at the the junction. C) The momentum with which a charged particle approaches a junction is unchanged as the charged particle leaves the junction. D) Conservation of energy. Show Answer Correct Answer: B) Conservation of charge and no accumulation of charge at the the junction. 46. Electric bulbs generate more heat because? A) Tungsten is a heating element. B) Glass is good conductor of heat. C) Gas inside bulb heats up. D) None of the above. Show Answer Correct Answer: A) Tungsten is a heating element. 47. Charging by ..... occurs when electrons are transferred from one object to another by direct contact. A) Conduction. B) Friction. C) Reduction. D) Induction. Show Answer Correct Answer: A) Conduction. 48. For the purification of a copper rod, we have to connect ..... as the positive electrode A) Graphite rod. B) Iron nail. C) Impure copper rod. D) Thin copper strip. Show Answer Correct Answer: C) Impure copper rod. 49. When you remove a bulb from a three bulb circuit, and the other two bulbs go off, then the bulbs must have been connected in parallel. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 50. Rainwater is a better conductor of electricity when compared to distilled water. Which of the following is correct justification for the given statement? A) Presence of oxygen in rainwater. B) Absence of dissolved salts in rainwater. C) Ionic dissociation takes place in rainwater. D) Flow of charges is inhibited in rainwater. Show Answer Correct Answer: C) Ionic dissociation takes place in rainwater. 51. A horizontal movement of ocean water that is caused by wind and that occurs at or near the ocean's surface. A) Global Conveyor Belt. B) Surface Current. C) Gyre. D) Gulf Stream. Show Answer Correct Answer: B) Surface Current. 52. Which of these is used for detecting weak electric current passing through a liquid? A) Torch. B) LED. C) CFL. D) None of these. Show Answer Correct Answer: B) LED. 53. Distilled water does not conduct electricity A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 54. What do you make if you wrap a current-carrying wire around an iron bolt? A) Electromagnet. B) Electric motor. C) Generator. D) None of the above. Show Answer Correct Answer: A) Electromagnet. 55. At the time of short circuiting the current in the circuit: A) Reduces substantially. B) Does not change. C) Increase heavily. D) Vary continuously. Show Answer Correct Answer: C) Increase heavily. 56. The most conducting liquids are the solutions of ..... A) Acids. B) Bases. C) Salts. D) All of the above. Show Answer Correct Answer: D) All of the above. 57. When electric current passes through a conducting solution, it causes ..... A) Chemical reactions. B) Light effect. C) Magnetic effect. D) Nucleus reaction. Show Answer Correct Answer: A) Chemical reactions. 58. A magnetic field does not exert a force on: A) An electric charge moving perpendicular to the field. B) A stationary charge. C) A magnetic needle. D) An iron bar. Show Answer Correct Answer: B) A stationary charge. 59. A tester is used to check the conduction of electricity through two liquids, labelled A and B. It is found that the bulb of the tester glows brightly forliquid A while it glows very dimly for liquid B. A) Liquid A is a better conductor than Liquid B. B) Liquid B is a better conductor than Liquid A. C) Both liquids are equally conducting. D) We cannot compare the conductivity this way. Show Answer Correct Answer: A) Liquid A is a better conductor than Liquid B. 60. Wires made from some special materials melt quickly and break when large electric currents are passed through them. These wires are used for making ..... ? A) Electric bulb. B) Electric fuses. C) Electric shock. D) Electric switch. Show Answer Correct Answer: B) Electric fuses. ← PreviousNext →Related QuizzesScience QuizzesClass 7 QuizzesClass 7 Science Chapter 10 Electric Current And Its Effects Quiz 1Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 2Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 3Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 4Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 5Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 6Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 7Class 7 Science Chapter 10 Electric Current And Its Effects Quiz 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books